The Mystery of the lost Island

When their beloved father goes away unexpectedly,Roberta,James ,Amber and their mother have to leave their happy life in London and move to a simple cottage in the countryside.The children's soon go to love the forest departments and gold mines that were near there house .They make friends with the head of forest department Mr:Jack and the local workers ,and have many exciting adventures .They find the secret diary and map of lost island .Soon,they find the island . They see a giant creature .What will happened next and :Where is father and will he ever return ? .